A.plc's POWER light does not shine?
The Mitsubishi Plc main unit and the front of the expansion have a "POWER" LED indicator. When the main unit is powered on, the green light of the LED is on. If the indicator is not lit after the host is powered on, please unplug the "24+" terminal. If the indicator lights up normally, it indicates that the DC load of the PLC is too large. In this case, please do not Use the DC power supply of the PLC "24+" terminal, please prepare a DC24V power supply separately.
If the wiring of the "24+" terminal is pulled out, the indicator light still does not illuminate, and the internal fuse may have been blown.
2. The POWER light is flashing?
If the POWER lamp is flashing, it is very likely that the "24+" terminal is short-circuited with the "COM" terminal. Please pull out the wiring of the "24+" terminal. If the indicator light returns to normal, please check your line. If the indicator light is still flashing, it is likely that the POWER board has failed.
3. "PROG‧E" LED light flashes
Generally speaking, when the red LED flashes, most of the cases are unreasonable in the program loop. Another reason may be that the parameter setting is wrong, or the external noise causes the program content to change. If you are using the handheld programmer (FX-20P-E), it is recommended that you check the D8004, and then check the D8060 to D8069 according to the contents of the D8004. A data can be obtained from D8060 to D8069. This is the error code.
4. "CPU‧E" LED light is on
When the "CPU‧E" LED is lit, it may be caused by the following reasons:
(1). Conductive dust intrusion inside the PLC
(2). The scan of the PLC exceeds 100ms (check the D8012 to know the longest execution time)
(3). There is noise interference near the PLC.
If you eliminate the above problem, and the "CPU‧E" LED is still on, this PLC may be really faulty, I suggest you send it for repair.
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